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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2aa240b6e2cbc4ccfcaf61452814ae682b7fce4c281416dc5410516e7fe87bc0' 
  AND token = 'pql0ARZHI227atGQeQF+IG05oE3N00S483RQ52iKNDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}